<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h1>首页</h1>
    <img src="/static/mm.jpg" />

    <!-- 建议 -->
    <img src="{{ url_for('static',filename='mm.jpg')}}" />
</body>
</html>